Echinozoa

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Echinozoa
The melon sea urchin (Echinus melo) in northwest Sardinia
Scientific classification
Kingdom: Animalia
Subkingdom: Eumetazoa
Superphylum: Deuterostomia
Phylum: Echinodermata
Subphylum: Echinozoa
Classes
Echinoidea
Holothuroidea
Ophiocistioidea
Helicoplacoidea
?Arkarua

† = Extinct

The Echinozoa are a subphylum of free-living echinoderms in which the body is essentially globoid with meriodional symmetry. They lack arms, brachioles, or other appendages, and do not at any time exhibit pinnate structure.[1]

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